Simple program problem from upper to lower case

[steals10304]

My homework is to create a program that changes an Uppercase letter to a lower case letter. My teacher has not introduced the tolower function, so I am not using it. We were also required to use the cout.put and cin.get functions. Anyway, my program works but when I send it through my teachers automated assignment checker I get 2 warnings (this will cost me points). The warnings are as follows:

Source 1.cpp(39) : warning C4244: 'argument' : conversion from 'int' to 'char', possible loss of data

and

cout.put((int)myLower); // cout.put outputs char found by myUpper + TOLOWER
Source 1.cpp(39): error 734: (Info -- Loss of precision (arg. no. 1) (31 bits to 7 bits))

Here is my code. Thank you for help in advance:

#include <iostream>
#include <cstdlib>
using namespace std;


int main()
{
   int myUpper;                                    // declares myUpper an integer allowing us to use const char TOLOWER
   int myLower;
   const int TOLOWER = ' ';                        // initializes TOLOWER to ' ' which has decimal value of 32
   
   cout << "Please Enter an Upper Case Letter: ";  // asks user for myUpper
   myUpper = cin.get();                            // cin.get takes first character entered by user
   myLower = myUpper + TOLOWER;                    // add value of 32 to upper case decimal value to find a lower case
   
   cout << "\nYour Lower Case Letter is: ";
   cout.put((int)myLower);                         // cout.put outputs char found by myUpper + TOLOWER
   cout << "\n\n";                                 // newlines entered for clarity

   return(EXIT_SUCCESS);
}

[Daved]

Are you aware of the char variable type?

[bithub]

Are you aware of the char variable type?

It doesn't matter since cin.get() returns an int and cout.put() takes a char, he will have a warning whichever way he declares the variable.

If you just want to get rid of the warning, you can do a cast:

cout.put(static_cast<char>(myLower));

If you want to avoid casts altogether, you can get input using ">>" instead of the get() function, and then declare all your variables are chars.

[Daved]

>> It doesn't matter since cin.get() returns an int and cout.put() takes a char,
I missed that at first, but according to dinkumware's reference put takes a char and get has a version that works with char as well.

>> you can get input using ">>" instead of the get() function
The assignment requires get and put.

[iMalc]

How on earth is anyone supposed to know that adding a space to an uppercase char makes if lowercase?
There are functions for that sort of thing: isupper and tolower, iirc.

Even if you insist on rolling your own, you should do:

lower = upper - 'A' + 'a';

Which it may help to think of as:

lower = 'a' + (upper - 'A');

That is of course after you've determined that it is even an alphabet character and not um say, a digit or punctuation mark etc.